Hi,

No, sorry there's no built-in function at the moment.

However you can write one in your theme functions.php file.

Example:

/**
 * Adds RSS to Stachethemes event calendar
 * RSS URL: [Website-URL]/?feed=stec-events
 */
add_feed('stec-events', function() {
    ob_start();
    header('Content-Type: ' . feed_content_type('rss-http') . '; charset=' . get_option('blog_charset'), true);
    echo '<?xml version="1.0" encoding="' . get_option('blog_charset') . '"?' . '>';
    ?>
    <rss version="2.0"
         xmlns:content="http://purl.org/rss/1.0/modules/content/"
         xmlns:wfw="http://wellformedweb.org/CommentAPI/"
         xmlns:dc="http://purl.org/dc/elements/1.1/"
         xmlns:atom="http://www.w3.org/2005/Atom"
         xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
         xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
         >
        <channel>
            <title>Stachethemes Calendar Events</title>
            <atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
            <link><?php bloginfo_rss('url') ?></link>
            <description><?php bloginfo_rss('description') ?></description>
            <?php
            $events = \Stachethemes\Stec\Events::get_events();
            foreach ($events as $event) :
                ?>
                <item>
                    <title><?php echo $event->get_title(); ?></title>
                    <link><?php echo $event->get_permalink(); ?></link>
                    <description><![CDATA[<?php echo $event->get_description() ?>]]></description>
                    <guid isPermaLink="false"><?php echo $event->get_uid(); ?></guid>
                    <author><?php echo get_the_author_meta('display_name', $event->get_author()); ?></author>
                </item>
            <?php endforeach; ?>
        </channel>
    </rss>
    <?php
    ob_get_flush();
});

Try this one:

$start      = '2019-01-01 00:00:00';
$end        = '2019-12-31 24:00:00';
$range_tz   = 'UTC';
$categories = [1, 2, 3]; // categories ids
$params     = array(
    'tax_query' => array(
        array(
            'taxonomy' => 'stec_event_category',
            'field'    => 'term_id',
            'terms'    => $categories
        )
    )
);
$events = \Stachethemes\Stec\Events::get_events_between($start, $end, $range_tz, $params);